<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        // |选择
        // ()分组
        var str =  "你去哪里，他在..."
        var reg = /你去|他在/g
        console.log(str.replace(reg,"*"));//*哪里，*...
    </script>
</body>
</html>